code: def grad_tlogpdf_scale(x, df, loc, scale):
      diff = x - loc
      return -(df * (scale**2 - diff**2)) / (
          scale * (df * scale**2 + diff**2)
      )
  
file_path: autograd/autograd/scipy/stats/t.py
imports: from __future__ import absolute_import
  import scipy.stats
  import autograd.numpy
  from autograd.extend import primitive, defvjp
  from autograd.numpy.numpy_vjps import unbroadcast_f
  from autograd.scipy.special import psi
label_desc: Use image node_id 4 for calling a global function with example usage: grad_tlogpdf_scale(x, df, loc, scale) and returns: unknown